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Retirement Plans - Narrative (Details) $ in Millions	12 Months Ended
	Sep. 30, 2022 USD ($) person	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Retirement Plans [Line Items]
Total employer contributions to defined benefit plans	$ 93
Voluntary contributions made by the company to defined benefit plans	0
Estimated future employer contributions to defined benefit plans in next fiscal year	38
Matching contributions charged to expense for defined contribution savings plans	$ 196	$ 118	$ 104
Number of multiemployer benefit plans in which the Company participates | person	270
Multiemployer plan, employer contribution, cost	$ 71	$ 67	$ 66
Postretirement Benefits
Retirement Plans [Line Items]
Total employer contributions to defined benefit plans	3
Estimated future employer contributions to defined benefit plans in next fiscal year	$ 3

X

- Definition

Defined benefit plan aggregate contributions.

+ References

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- Definition

Number of multiemployer benefit plans in which the Company participates.

+ References

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Retirement Plans [Line Items]

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- Definition

Voluntary contributions made by the company to defined benefit plans.

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- Definition

Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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- Definition

Amount of cost for defined contribution plan.

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Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

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